Bottom portion housing of a mobile device



FIG. 1 is a first side view of an ornamental design of an embodiment ofa bottom portion housing of a mobile device showing our new design;

FIG. 2 is a second side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a third side view thereof;

FIG. 5 is a fourth side view thereof; and

FIG. 6 is a bottom view thereof; and,

FIG. 7 is an isometric view thereof.

The broken lines shown in FIGS. 1-7 are included for illustrativepurposes only and form no part of the claimed design.

The ornamental design for a bottom portion housing of a mobile device,as shown and described.